Mica lamp-chimney.



No. 744,828. PATENTED NOV. 24, 1903.

I J. D. WARREN.

MICA LAMP CHIMNEY. AAAAAAAA ION FILED JUNE 9, 1902.

N O M O D E L.

llwirnn Frans Patented November 24, 1903.

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JOHN D. WARREN, OF NEW YORK, N. Y., ASSIGNOR OF ONE-HALF TO EUGENE MUNSELL do 00., OF NEW YORK, N. Y., A COPARTNERSHIP.

lVilCA LAIVl P -CHIMNEY.

SPECIFICATION forming part of Letters Patent No. 744,828, dated November 24, 1903.

Application filed June 9. 1902. Serial No. 110,743. kNo model) To [Z/ZZ whom, it may concern:

Be it known that I, JOHN D. WARREN, a citizen of the United States, residing at New York, in the county of New York and State 5 of New York, haveinvented a new and useful Mica Chimney, of which the following is a specification.

This invention relates to that class of lam pchimneys which are employed in connection with gas or hydrocarbon burners employing mantles or hoods of refractory material.

The especial object of this invention is to provide a substantially indestructible lampchimney which can be more readily cleaned I or polished than the lamp-chimneys which have heretofore been employed and which can be kept in stock or shipped in the form of flat sheets, so that the same will occupy comparatively little room and will not be liazo ble to be crushed or injured during transportation.

To this end this invention consists of the chimney and of the combinations of parts therewith, as hereinafter described, and more particularly pointed out in the claims at the end of this specification.

In the accompanyingdrawings, Figure 1 is perspective view, partially broken away, of a chimney constructed according to this in- 0 vention. Fig. 2 is a perspective view, partially broken away, showing the chimney in its opened or knockdown condition. Fig. 3 is a perspective view of a slightly-modified form of construction, and Fig. 4: is an en- 5 larged detail View of the detachable fastenings.

One of the most serious problems which is now encountered in the use of the incandescent mantles which are extensively employed in connection with the Bunsen type of gas or hydrocarbon burners is to provide a protectingchimney which is not liable to break when exposed to the intense heat of the burner and which can be readily cleaned when it be- 5 comes smoked up or dirty.

The use of glass chimneys in connection with the form of burners referred to, especially in locations where the burner is to be exposed to draft or changes of temperature,

has been found to be decidedly objectionable, as such glass chimneys are liable to crack and break, so that instead of protectingthe fragile incandescent mantle the breaking of such chimneys will also shatter the mantle. To overcome this objection, it has been proposed to employ prolectingchimneys of sheet-mica.

The mica chimneys which have heretofore been employed have the advantage of not being affected by the heat of the burner; but in practice it has been found that the ordi- 6o narymica chimneys which have heretofore been employed are apt to become quickly blackened ordiscolored, so as to be rendered unsightly and to cut off a considerable part of the light. 6

To polish or clean a mica chimney, the entire inner surface of the chimney ought to be rubbed over, and this cannot be readily done in connection with the ordinary forms of mica chimneys which have heretofore been employed. In addition to this the ordinary mica chimneys are comparatively bulky, and during the shipping or handling of the same after the mica is strained or distorted into tubular form the mica is liable to be flaked off-and the chimneys injured.

The especial object of my present invention is to provide a knockdown mica chimney for use in connection with the class of burners referred to which can be stored or shipped in the form of fiat sheets, which may be readily set up to form tubular chimneys, and which may be taken down and opened as frequently as may be requiredfor polishing or cleaning. To accomplish this object, a mica chimney constructed according to my invention consists, essentially, of a body portion of mica having fastenings permanently securedalong its edges which hold the chimney in curved shape when set up, but which 0 can be unfastened to permit the chimney to be unrolled for cleaning or for shipping purposes.

Referring to the drawings, and in detail, in Figs. 1 and 2 I have illustrated a chimney 5 constructed according to my invention having a body. portion A, consisting of a single sheet of mica. Atits opposite edges the body portion is provided with fastening-strips B and O for holding the chimney in its rolled or set-upshape. These fastening-strips B and O are substantially lVl shape in cross-section.

One fold of each strip is closed upon the edge of the mica body portion A, while the other fold thereof is left opened to form a book. These strips are applied oppositely to the edges of the mica section A, so that the free hooks of the strips B and C will stand on opposite sides of the body portion A, whereby when the chimney is rolled into cylindrical form the hooks will come in position to properly interlock. It is obvious with this construction that the chimney can be rolled up with either surface of the body portion outermost.

It will be noted that the fastening, devices interlock Without alteration and hold the body portion in cylindrical shape. It also will be noted that the fastening devices interlock by an expanding movement of the body portion and unlock by a contracting movementof the body portion. This arrangement allows the use of fastening devices which can be locked or unlocked without alteration or distortion and which when locked will resist the resiliency of the body portion.

In some cases instead of forming the body portion of the chimney from a single sheetof mica the body portion of the chimney may comprise a number of separate pieces. For example, as illustrated in Fig. 3, the body portion comprises the three sections D, E, and F, which are permanently connected by metal joining-strips G, which are S shape in cross section and are permanently closed onto the edges of the separate mica sections.

While the chimney is especially adapted for use in connection with incandescent mantles, such as employed on the ordinary Welsbach and similar burners, of course the chimneys can be applied to any kind of a light.

I am aware that numerous changes may be made in theconstruction of mica chimneys without departing from the scope of my invention as expressed in the claims, and I do not wish, therefore, to be limited to the particular construction I have herein shown and described nor to the use of any particular form of detachable connection for holding the edges of the mica body portion together; but

What I do claim, and desire to secure by Letters Patent of the United States, is

1. As an article of manufacture, a knockdown mica chimney consisting of a body portion which can be rolled into cylindrical form, and a fastening device permanently secured to each of the edges which meet when the chimney is set up, which fastening devices are constructed to interlock without alteration and hold the body portion in cylindrical shape, and to unlock without alteration and allow the chimney to be unrolled.

2. As an article of manufacture, a knockdown chimney consisting of a body portion, which can be rolled, into cylindrical form and a fastening device permanently secured to each of the edges which meet when the chimney is rolled up, said fastening devices being arranged to interlock by an expanding movement of the body portion and to unlock by a contracting movement of the body portion.

8. As an article of manufacture, a knockdown chimney consisting of a body portion of mica and having binding-strips permanently secured to its opposite edges, which bindingstrips interlock to form fastenings by an expanding movement of the body portion and u nlock by a contracting movement of the body portion.

4. As an article of manufacture, a knockdown chimney consisting of a body portion of mica having binding-strips permanently secured along each of its opposite edges, which strips have free hooks standing on opposite sides of the body portion to form permanentlysecured interlocking fastenings.

5. As an article of manufacture, a knockdown chimney consisting of a body portion of mica, and a fastening-strip of substantially M -shape section secured to opposite edges of the mica body portion, the free hooks of said fastening-strips facing oppositely on the body portion when flat, whereby the same can interlock to hold the chimney set up in cylindrical form.

6. As an article of manufacture, a knockdown chimney, consisting of a body portion comprising a number of independent pieces of mica permanently fastened together, and detachably-interlockin g means secured to the edges of the body portion thus formed, for holding the chimney set up, or for permitting the same to be unrolled for cleaning or shipping purposes.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

JOHN D. WARREN.

Witnesses:

LOUIS W. SOUTHGATE,

MARY E. REGAN. 

